Combined pump and piston rod.



No. 784,692. PATENTED MAR. 14, 1905.

, J. P. LEARY.

COMBINED PUMP AND PISTON ROD.

APPLIDATION FILED OUT. 28. 1904.

- Qwwfoz Wifmogeo J 71 [J g attomwlg UNITED STATES Patented March 14, 1905.

PATENT OEEicE.

COMBINED PUMP AND PISTON ROD.

SPECIFICATION forming part of Letters Patent No. 784,692, dated March 14, 1905.

Application filed October 28, 1904. Serial No. 230,411.

. To all whom it may concern.-

Be it known that I, JOHN F. LEARY, a citizen of the United States, residing in Luzerne borough, in the county of Luzerne and State of Pennsylvania, have invented certain new and useful Improvements in a Combined Pump and Piston Rod; and I do declare the following to be a full, clear, and exactdescription of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention is an improved combined pump and piston rod for use in steam-pumps which are employed for pumping mines; and it consists in the construction, combination, and arrangement of devices hereinafter described and claimed.

The object of my invention is to provide a combined pump'and piston rod which is made of separable sections, the pump-section of the rod being made of bronze or other material which is capable of resisting the acids contained in water pumped from mines, which comparatively acid proof section may be readily detached from the end of the piston and replaced by another at a comparatively small cost and in a very short time.

A further object of my invention is to provide improved means for coupling the separable sections of the pump and piston rod together.

A further object of my invention is to effect improvements in the construction of the head of one section of the piston-rod and to combine therewith an improved form of tappet-arm for operating the valve-rod of the engine, which tappet-arm comprises a pair of sections detachably secured together, the section and the head of the piston-rod being provided with engaging means to secure said sections of the tappet-arm to the said head.

In the accompanying drawings, Figure 1 is a side elevation of a pumping-engine of common form provided with my improved combined pump and piston rod and my improved tappet-arm for operating the valve-rod. Fig. 2 is a detail view, partly in elevation and partly a longitudinal section, showing portions of the separable sections of the combined pump and piston rod and the means for coupling them together. Fig. 3 is a vertical transverse sectional view talzen on a plane intersecting the threaded stem of the bronze or acid-proof pump-section of the rod, the head of the steel or engine section of the rod, and also intersecting the tappetarm and the valverod and showing the means for securing the sections of the tappet-arm together and also for securing the tappet-arm to the said head. Fig. at is a similar view taken on a plane intersecting the threaded stem of the bronze or acid-proof section of the red, the head of the steel section of the rod, and disclosing the locking-key.

Heretofore in pumping-engines employed for pumping the water from mines, which water is acidulated and exceedingly corrosive, it has been the practice to employ a piston-rod for the piston of the engine and the plunger of the pump, which piston-rod is made of bronze and is very expensive. The bronze is, as compared with a steel piston-rod, better enabled to resist the action of the acids with which the water is charged and is much more durable, but, nevertheless, in a comparatively short time becomes so worn and eaten by the acids as to render it necessary to replace it with another. In practice I have found that such bronze rods, which cost from sixteen to thirty dollars, according to the size and capacity of the pump on which they are employed, last only about a month and have to be renewed at the end of that period. To effect an economy in the cost of maintainii'ig a pump of this kind in operation, I have invented a combined pump and piston rod comprising two detachable sections, the one connected to the engine-piston being of steel or iron and the other, which is connected to the pump-plunger, being of bronze or other suit able comparatively acid-proof material and detachably connected to the piston-section.

In carrying out my invention I provide the piston-section 1 of the rod, which may be of steel, with a head 2, in which is a screwthreaded centrally-located longitudinal bore 8, which is open at the outer end of the head. On the upper side of the said head, at the center thereof, is a longitudinal dovetail flange 4:, which is provided at or near its center with a transverse groove 5. At a point coincident with the inner end of the screw-threaded bore 3 the said head is provided with a transverse bore 6. The plunger-section 7 of my improved combined pump and piston rod is made of bronze or other suitable comparatively non-corrosive or acid-proof material, and the same is provided at its outer end with a screw-threaded stem 8, which is adapted to be screwed into the threaded bore of the head 2, so as to couple said acid-proof section to the piston-section of the rod. To prevent casual disengagement of the bronze section from the steel section of the rod, 1 provide a wedge-key 9, which is driven into and through the cross bore 6 of the head 2 and is caused to impinge upon the extreme end of the bronze section, so as to jam the threads of the latter against the threads of the bore and to also jam the key against the ends of the bronze section, as will be understood.

\Vhen the bronze section or comparatively acid-proof plunger-section of the rod becomes worn and useless, it may be replaced at comparatively small cost and without the necessity of removing the piston and piston-rod section 1 from the engine cylinder a of the pump, it being only necessary to drive out the wedge-key 9, remove the outer head of the pump-cylinder b, uncouple the bronze section 7 from the steel section 1 by unscrewing said bronze section, detach the bronze section from the pump-plunger c, attach an other bronze section to the pump-plunger, and couple the new bronze section to the steel section 1 before again starting the pump in operation. Since the bronze section is only half the length of the combined pump and piston rod, it will be understood that it is correspondingly cheaper than a pump and piston rod which is entirely of bronze from end to end and such as has been heretofore used.

The tappet-arm 10, which by coaction with the tappet ll of the valve-rod 12 of the engine operates said valve-rod in the manner well known to those skilled in the art to which my invention relates, is composed of a pair of sections 13 14:, detachably secured together by a bolt 15, having their upper ends turned laterally in opposite directions to form a bilurcation 16 to receive and clear the valve-rod and having their lower ends formed with dovetail members 17 to engagethe dovetail flange 4 of the head 2. The lower ends of the said sections are connected together by a bolt 18, which lies in the groove or slot 5 and serves not only to clamp the lower ends of the sections together, but also to clamp them against and secure them firmly to the dovetail flange of the piston-rod-section head.

From the foregoing description, taken in connection with the accompanying drawings, the construction and operation of the invention will be readily understood without requiring a more extended explanation.

Various changes in the form, proportion, and the minor details of construction may be resorted to without departing from the principle or sacrificing any of the advantages of this invention.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. In combination with a piston-rod having a head provided with a dovetail flange, a tappet-arm to operate a valve-rod and comprising a pair of separable sections formed with dovetail members at their lower ends to engage said dovetail flange of the piston-rod head, and a bolt extending transversely through said sections of the tap pet-arm and said dovetail flange of the piston-rod head.

2. In combination with a piston-rod having a head provided with a dovetail flange, a tappet-arm to operate a valve-rod and comprising a pair of separable sections formed with dove tail members at their lower ends to engage said dovetail flange of the piston-rod head, and a bolt extending transversely through said sections of the tappet-arm and said dovetail flange of the piston-rod head, said dovetail flange of said head having a transverse groove or slot for the reception of said bolt.

In testimony whereof I have hereunto set my hand in presence of two subscribing witwitnesses.

JOHN F. LEARY.

\Vitnesses:

W M. J. Caossmn, WM. FORSYTH. 

